A copartnership



PATENTED FEBL 2, 1904.

J T EX J. CARR.

LATHE TOOL HOLDER.

APPLIOATION FILED FEB. 9, 1903.

N0 DEL. I

WITNESSES,-

UNITED STATES Patented February 2, 1904.

PATENT OEEICE.

JAMES CARR, OF SYRACUSE, NEW YORK, ASSIGNOR TO CARR BROTHERS, OFSYRACUSE, NEW YORK, A COPARTNERSHIP.

LATHE TOOL-HOLDEFL.

SPECIFICATION forming part of Letters Patent No. 751,054, dated.February 2, 1904.

Application filed February 9, 1903. Serial No. 142.488. (N0 model.)

To all whom it may concern.-

Be it known that I, JAMEs CARR, of Syracuse, in the county of Onondaga,in the State of New York, have invented new and useful Improvements inLathe Tool-Holders, of which the following, taken in connection with theaccompanying drawings, is a full, clear, and exact description.

This invention relates to improvements in tool-holders, and relates moreparticularly to that class which is adapted to be inserted in theordinary tool-post of a lathe.

The object of my present invention is to provide a straight bar or shankwith a revoluble tool-holder which is disposed at an angle other than aright angle with the bar or shank, whereby the cutting-tool, which isadapted to be inserted into the holder, is held at an angle other than aright angle with the bar with its cutting edge uppermost, so as toaflord a shearing out upon the article being milled.

Another object is to permit the tool-holder to be rotated with the tooltherein, so that the horizontal angle of the tool may be changed forright or left hand work and still maintain the tool inavertically-inclined position with its cutting edge uppermost.

Further objects of this invention will appear in the subsequentdescription.

Referring to the drawings, Figure 1 and 2 are respectively top plan andside elevation of my improved tool-holder. Fig. 3 is a sectional viewtaken on line 3 3, Fig. 1. Fig. l is a sectional view taken on line 4 4,Fig. 2. Figs. 5 and 6 are sectional views similar to Fig. 4, showing thetool in different positions, one for left-hand work and the other forrighthand work. Fig. 7 is a sectional view similar to Fig. 3 of aslightly-modified form of shank and tool-holder. Fig. 8 is a sectionalView taken on line 8 8, Fig. 7

Similar reference characters indicate corresponding parts in all theviews.

In carrying out the object of my invention I provide anupwardly-deflected shank or bar 1 with a head 2, said head beingprovided with a circular opening or bore 3, extending therethrough fromthe top to bottom and disposed at an angle other than a right angle withthe into and out of registration with a lengthwise slot 7 in the shank land head 2, and both slots are disposed at substantially right angleswith the axes of the revoluble tool-holder 4. The tool-holder4 isinserted in the lower end of the opening 3 of the head 2 and is ofslightly less length than the headthat is, the upper end terminatesbeneath the upper end of the opening when the tool is clamped inposition so that the head 5, which forms the lower wall of the slot 6,firmly engages the lower face of the tool and impinges the upper face ofsaid tool against the upper wall of the slot 7 0f the head 2. Aclamping-screw 8 is inserted in the upper end of the opening 3 and isengaged with the threaded socket 9, opening inwardly from the upper endof the tool-holder 4, said screw being provided with an enlarged head 10and an angular bolt-head 11, the enlarged portion 10 of the screw beingadapted to engage the upper face of the head 2 to hold the screw frominward movement and at the same time to permit the screw to draw thetoolholder 4 upwardly, so, as to impinge the tool, as 12, between thelower enlarged end of the tool-holder and upper wall of the slot 7, asuitable wrench being applied to the angular portion 11 for operatingthe screw. The slot 6 in the tool-holder is of just suiiicient size toreceive a tool 12 and permit its free endwise movement for withdrawal orinsertion when the clamping-bolt 8 is loosened. The slot 7 preferablyextends through the front and sides of the head 2 and is continueddownwardly and rearwardly through the bottom of the shank, so that toolsof different lengths may be employed and may be placed at diiferenthorizontal angles with the shank.

In Figs. 1, 2, and 3 I have shown the tool as used for straightwork-that is, its rear end is inserted into the slot at the rear of thetoolholder, and is therefore held in alinement with the shank; but it issometimes desired to throw the cutting edge of the tool to the right orleft, which requires that the tool be loosened and partially withdrawnand the tool-holder be rocked in its bearing for tilting the toolhorizontally to different angles. so that the heel of the tool whenreinserted lies along the outer side face of the shank and engages thesame at the rear of the tool-post; but in either of these positions thetool is held with the cutting edge uppermost, so that no matter whatposition the tool assumes the cutting edge is always higher than theheel of the tool and the heel always has a bearing on the shank, whichis an important feature of this invention, for the reason that a heaviercut can be made than would be possible if the tool were disposed in ahorizontal position and its heel unsupported.

Another feature of this invention is that different tools may beinserted in the tool-holder without removing the shank from the maintool-post of the lathe, and these tools being very much smaller thanthose commonly employed it is evident that they are more easily temperedand can be manufactured at a minimum cost.

In Fig. 7 of the drawings I have shown a shank 1, consisting of centraland side bars 1& and 15,the central bar beingmovable lengthwise of theside bars and the side bars being provided with a yoke or head 16. Theouter end of the yoke 16 and adjacent face of the central bar 14. areseparated from each other and are disposed in a vertical plane at anangle other than a right angle with the shank and constitute jaws forholding a revoluble tool-holder 17. The tool-holder and also the yoke 16and bar 14 are provided with slots arranged at substantially rightangles with the axis of the tool-holder for receiving the tool, as 12,which is held in position by a clamping-screw 18 in the upper end of thetoolholder. The slot in the yoke 16 extends through its side walls topermit the tool to be swung laterally for right or left hand work. Thefront ends of the side bars 15 are locked to the rear ends of the yoke16 by a pin 19, which passes through an elongated slot 20 in the frontend of the central bar let, and the rear ends of the side bars 15 areunited by a pin 21, which passes through an elongated slot 22 in therear end of the central bar, the pin 21 being provided with a threadedopening 23, in which is movable an adjusting-screw 2st. The inner end ofthis adjusting-screw is engaged with the adjacent end face of thecentral bar 1 1, and it is evident that by rotating the set-screw in onedirection the yoke 16 and adjacent end of the central bar 1 1 are causedto approach each other and to engage the tool-h older for holding thesame from rotation or endwise movement, and by rotating the screw in theopposite direction the yoke and adjacent end of the bar 14L areseparated and said tool-holder is thereby released and may be rotated tochange the angle of the tool to the right or left.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, is

1. In a lathe tool-holder, a bar having in one end a cylindrical openingtherethrough from top to bottom and inclined from a perpendicular to thebar, said bar havingacentral lengthwise opening extending at rightangles to and intersecting the first-named opening to receive and holdthe heel of the tool, and a tool-holder journaled in the first-namedopening and provided with a slot movable into and out of registrationwith the lengthwise opening in the bar to receive the body of the tool,and means to clamp the tool-holder in place.

2. A lathe tool-holder, comprising a bar having one end deflectedupwardly and provided with a circular bore therethrough from top tobottom and inclined from a perpendicular to the body of the bar, thelower and upper faces of the upwardly-deflected portion being disposedin parallel planes at an angle with the bar and at right angles to thebore, said bar having a central lengthwise opening extending rearwardlyand downwardly from the bore to receive and support the heel of thetool,a revoluble tool-holder journaled in the bore and provided with a slotmovable into and out of registration with the lengthwise opening toreceive the body of the tool, portions of the front and side walls ofthe bore being cut away to form tool-engaging shoulders at the rear ofthe bore and at the sides of the lengthwise opening, and means to clampthe tool-holder in place.

3. A lathe tool-holder comprising a shank or bar having one enddeflected upwardly and provided with a circular bore inclining upwardlyand rearwardly from its lower face through its upper face, said barhaving a central lengthwise opening extending rearwardly and downwardlyfrom the bore and continued through the front and sides of the head toreceive the tool, the side walls of the lengthwise opening terminatingat the rear of the bore to form abutments for the tool, a tool-holderrotatively mounted in the bore and having a slot movable into and out ofregistration with the lengthwise opening, and means to clamp thetool-holder in place;

In witness whereof I have hereunto set my hand this 3d day of February,1903.

JAMES CARR.

WVitnesses:

H. E. CHASE,

MILDRED M. Nor'r.

